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HIGH severity

CVE-2021-4278 — tree-kit

HIGHFix: cronvel/tree-kit@a63f559

CVE-2021-4278 is a high-severity (CVSS 7.8) CWE-1321 vulnerability in tree-kit. A fix is available for tree-kit — see the affected versions and patch details below.

tree-kit vulnerable to Prototype Pollution

Also known asGHSA-mw4x-g2x8-qcvf
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs39th percentile — riskier than 39% of all scored CVEsHighest risk
0.00%0.32%0.63%0.95%0.1%0.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

29other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
tree-kitnpm
228Kdownloads / week

Description

A vulnerability classified as problematic has been found in cronvel tree-kit up to 0.6.x. This affects an unknown part. The manipulation leads to improperly controlled modification of object prototype attributes ('prototype pollution'). Upgrading to version 0.7.0 is able to address this issue. The name of the patch is a63f559c50d70e8cb2eaae670dec25d1dbc4afcd. It is recommended to upgrade the affected component. The identifier VDB-216765 was assigned to this vulnerability.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmtree-kitall versions0.7.0npm install tree-kit@0.7.0

Affected Products

1 product · 1 configurations
Application
tree kittree_kit_project
< 0.7.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for tree-kit, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update tree-kit to 0.7.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-4278 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

A vulnerability classified as problematic has been found in cronvel tree-kit up to 0.6.x. This affects an unknown part. The manipulation leads to improperly controlled modification of object prototype attributes ('prototype pollution'). Upgrading to version 0.7.0 is able to address this issue. The name of the patch is a63f559c50d70e8cb2eaae670dec25d1dbc4afcd. It is recommended to upgrade the affected component. The identifier VDB-216765 was assigned to this vulnerability.
O3 Security · Impact-Aware SCA

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CVE-2021-4278: tree-kit — Fixed in 0.7.0